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Thermal Control System
Fig.: Nodal model
The TCS has to ensure the required working temperature ranges for all instruments, components and subsystems of the satellite in all BIRD-Mission-Phases. BIRD-TCS will be passive and uses merely the dissipated heat of all components of the S/C system and Payload, except the special requirements to the IR-Sensor-Cooling. The fundamental structural subdivision of the inner satellite structure on the three segment planes "Service-Segment", "Electronics-Segment" and "Payload-Segment" shall be kept for the TCS in principle also. The TCS for the IR-Payload-Complex is autonomous. A mechanical cooling device (Stirling Cooler) is used for IR-Sensor-Cooling, its operating heat loss is radiated to free space via a separate complex of cryo store/heat transfer system/radiator.
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